package com.cql.common.utils.file;


import com.cql.common.config.FoodCircleConfig;
import com.cql.common.constant.FoodCircleConstant;
import com.cql.common.exception.file.FileNameLengthLimitExceededException;
import com.cql.common.exception.file.FileSizeLimitExceededException;
import com.cql.common.exception.file.InvalidExtensionException;
import com.cql.common.utils.DateUtils;
import com.cql.common.utils.StringUtils;
import com.cql.common.utils.spring.SpringUtils;
import com.cql.common.utils.uuid.IdUtils;
import org.apache.commons.io.FilenameUtils;
import org.springframework.web.multipart.MultipartFile;

import java.io.File;
import java.io.IOException;

/**
 * 文件上传工具类
 *
 * @author ruoyi
 */
public class FileUploadUtils {


    /**
     * 默认大小 50M
     */
    public static final long DEFAULT_MAX_SIZE = 50 * 1024 * 1024;

    /**
     * 默认的文件名最大长度 100
     */
    public static final int DEFAULT_FILE_NAME_LENGTH = 100;

    /**
     * 默认上传的地址
     */
    private static String defaultBaseDir = SpringUtils.getBean(FoodCircleConfig.class).getProfile();

    public static void setDefaultBaseDir(String defaultBaseDir) {
        FileUploadUtils.defaultBaseDir = defaultBaseDir;
    }

    public static String getDefaultBaseDir() {
        return defaultBaseDir;
    }

    /**
     * 以默认配置进行文件上传
     *
     * @param file 上传的文件
     * @return 文件名称
     * @throws Exception
     */
    public static final String upload(MultipartFile file) throws IOException {
        try {
            return upload(getDefaultBaseDir(), file, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION);
        } catch (Exception e) {
            throw new IOException(e.getMessage(), e);
        }
    }

    /**
     * 根据文件路径上传
     *
     * @param baseDir 相对应用的基目录
     * @param file    上传的文件
     * @return 文件名称
     * @throws IOException
     */
    public static final String upload(String baseDir, MultipartFile file) throws IOException {
        try {
            return upload(baseDir, file, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION);
        } catch (Exception e) {
            throw new IOException(e.getMessage(), e);
        }
    }

    /**
     * 文件上传
     *
     * @param baseDir          相对应用的基目录
     * @param file             上传的文件
     * @param allowedExtension 上传文件类型
     * @return 返回上传成功的文件名
     * @throws FileSizeLimitExceededException       如果超出最大大小
     * @throws FileNameLengthLimitExceededException 文件名太长
     * @throws IOException                          比如读写文件出错时
     * @throws InvalidExtensionException            文件校验异常
     */
    public static final String upload(String baseDir, MultipartFile file, String[] allowedExtension)
            throws FileSizeLimitExceededException, IOException, FileNameLengthLimitExceededException,
            InvalidExtensionException {
        /**
         * 获取上传文件原名字长度
         */
        int fileNamelength = file.getOriginalFilename().length();
        /**
         * 判断长度是否超过系统默认长度100
         */
        if (fileNamelength > FileUploadUtils.DEFAULT_FILE_NAME_LENGTH) {
            throw new FileNameLengthLimitExceededException(FileUploadUtils.DEFAULT_FILE_NAME_LENGTH);
        }

        /**
         * 校验文件是否合法
         */
        assertAllowed(file, allowedExtension);

        /**
         * 编码文件名：如：2021/12/05/40ae79ee-1fe8-4a5d-8a26-376ca56d88e3.png
         */
        String fileName = extractFilename(file);

        /**
         * baseDir：D:/ruoyi/uploadPath/upload
         * fileName：原文件名
         * 设置文件绝对路径：D:/ruoyi/uploadPath/upload/2018/08/08/uuid.jpg
         */
        File desc = getAbsoluteFile(baseDir, fileName);
        /**
         * 文件上传
         */
        file.transferTo(desc);
        /**
         * 获取文件路径：
         * pathFileName：/profile/upload/原文件名
         */
        String pathFileName = getPathFileName(baseDir, fileName);
        return pathFileName;
    }

    /**
     * 编码文件名
     */
    public static final String extractFilename(MultipartFile file) {
        String fileName = file.getOriginalFilename();
        String extension = getExtension(file);
        fileName = DateUtils.datePath() + "/" + IdUtils.fastUUID() + "." + extension;
        return fileName;
    }

    public static final File getAbsoluteFile(String uploadDir, String fileName) throws IOException {
        /**
         * baseDir：D:/IDEA/food_circle/food_circle_web/target/classes/static/imgs
         * fileName：原文件名
         *
         * uploadDir + File.separator + fileName = D:/IDEA/food_circle/food_circle_web/target/classes/static/imgs/2021/12/05/40ae79ee-1fe8-4a5d-8a26-376ca56d88e3.png
         */
        File desc = new File(uploadDir + File.separator + fileName);

        /**
         * 不存在才进入
         */
        if (!desc.exists()) {
            if (!desc.getParentFile().exists()) {
                /**
                 * 创建目录
                 */
                desc.getParentFile().mkdirs();
            }
        }
        return desc;
    }

    private static final String getPathFileName(String uploadDir, String fileName) throws IOException {
        /**
         *  uploadDir：D:/IDEA/food_circle/food_circle_web/target/classes/static/imgs
         *  fileName：2021/12/05/40ae79ee-1fe8-4a5d-8a26-376ca56d88e3.png
         */
        int dirLastIndex = SpringUtils.getBean(FoodCircleConfig.class).getProfile().length() + 1;
        //currentDir：upload
        String currentDir = StringUtils.substring(uploadDir, dirLastIndex);
        //pathFileName：/profile/upload/原文件名
        String pathFileName = FoodCircleConstant.RESOURCE_PREFIX + "/" + currentDir + "/" + fileName;
        return pathFileName;
    }

    /**
     * 文件大小校验
     *
     * @param file 上传的文件
     * @return
     * @throws FileSizeLimitExceededException 如果超出最大大小
     * @throws InvalidExtensionException
     */
    public static final void assertAllowed(MultipartFile file, String[] allowedExtension)
            throws FileSizeLimitExceededException, InvalidExtensionException {
        /**
         * 获取文件大小
         */
        long size = file.getSize();
        /**
         * 判断文件是否过大,默认长度50M
         */
        if (DEFAULT_MAX_SIZE != -1 && size > DEFAULT_MAX_SIZE) {
            throw new FileSizeLimitExceededException(DEFAULT_MAX_SIZE / 1024 / 1024);
        }
        /**
         * 获取文件原名字
         */
        String fileName = file.getOriginalFilename();
        /**
         * 获取文件后缀
         */
        String extension = getExtension(file);
        /**
         * 判断是否是合法类型
         */
        if (allowedExtension != null && !isAllowedExtension(extension, allowedExtension)) {
            if (allowedExtension == MimeTypeUtils.IMAGE_EXTENSION) {
                throw new InvalidExtensionException.InvalidImageExtensionException(allowedExtension, extension,
                        fileName);
            } else if (allowedExtension == MimeTypeUtils.FLASH_EXTENSION) {
                throw new InvalidExtensionException.InvalidFlashExtensionException(allowedExtension, extension,
                        fileName);
            } else if (allowedExtension == MimeTypeUtils.MEDIA_EXTENSION) {
                throw new InvalidExtensionException.InvalidMediaExtensionException(allowedExtension, extension,
                        fileName);
            } else if (allowedExtension == MimeTypeUtils.VIDEO_EXTENSION) {
                throw new InvalidExtensionException.InvalidVideoExtensionException(allowedExtension, extension,
                        fileName);
            } else {
                throw new InvalidExtensionException(allowedExtension, extension, fileName);
            }
        }

    }

    /**
     * 判断MIME类型是否是允许的MIME类型
     *
     * @param extension
     * @param allowedExtension
     * @return
     */
    public static final boolean isAllowedExtension(String extension, String[] allowedExtension) {
        for (String str : allowedExtension) {
            if (str.equalsIgnoreCase(extension)) {
                return true;
            }
        }
        return false;
    }

    /**
     * 获取文件名的后缀
     *
     * @param file 表单文件
     * @return 后缀名
     */
    public static final String getExtension(MultipartFile file) {
        String extension = FilenameUtils.getExtension(file.getOriginalFilename());
        if (StringUtils.isEmpty(extension)) {
            extension = MimeTypeUtils.getExtension(file.getContentType());
        }
        return extension;
    }
}
